An officer wearing a body camera gives a brief tour of a flat in Candia Towers, on Jason Street, Everton, which had been totally given over to cannabis production.

In the video large lighting rigs can be seen along with growing bags in the flat, which had its windows boarded and had been stripped of all furniture to turn it into an industrial level drugs farm.

When he walks into one of the furthest rooms the scale of the criminality becomes obvious as the entire floor space is filled with lush green cannabis plants with barely any space in between.

Police, who spent yesterday removing the cannabis, estimate that more than 2,000 plants were growing in eight flats across three floors of the high rise and could have been worth as much as £10m.

Four men: Nam Van Le, 49, of Jason Street, Everton; Nam Van Ntuyen, 36; Thanh Duc Dong, 49 and of no fixed abode Doan Xuan Quynh, 39, all of no fixed abode, were due in court this morning charged with production of cannabis.